EXPLAIN ANALYZE in PostgreSQL is like turning on X-ray vision for your queries. It lets you peek under the hood of your SQL to see what the planner thinks *and* what actually happened. Whether you're fighting slow queries or just flexing your database muscles, mastering EXPLAIN ANALYZE can save you hours of debugging and boost app performance.

MVCC (Multi-Version Concurrency Control) is the backbone of PostgreSQL’s concurrency model. Unlike locking mechanisms that stall readers or writers, MVCC allows multiple transactions to access the database simultaneously without stepping on each other’s toes. This blog dives deep into how PostgreSQL achieves this magic, what snapshots and visibility maps are, and how vacuuming keeps things in check.